694
FNCA52 TJSJ 041930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST THU JUN 4 2026
DISCUSSION
CLOUDS HAVE INCREASED IN COVERAGE THIS AFTERNOON ALONG EASTERN
SOUTHERN PORTIONS OF PUERTO RICO UNDER A SOUTHEASTERLY FLOW. FOR
MOST STATIONS, RELATIVE HUMIDITIES STAYED IN THE 60-70%, WITH
WINDS BELOW 15 MPH. THE EXCEPTION WAS CABO ROJO RAWS, WITH VALUES
OF 55% AND WINDS OF 15 MPH FOR AT LEAST AN HOUR. TAKING THESE
FACTORS INTO CONSIDERATION, THE RISK FOR FIRE SPREADING IS LOW.
PRZ014-050800-
SOUTHEAST COASTAL PLAINS-
330 PM AST THU JUN 4 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 30 0 10 0
TEMP (24H TREND) 72 (-2) 91 (+3) 73 92
RH % (24H TREND) 93 (+1) 56 (-4) 95 59
WIND 20FT/EARLY(MPH) E 12 E 14 E 12 E 14
WIND 20FT/LATE(MPH) E 10 SE 14 E 11 SE 16
MIXING HGT(FT-AGL/MSL) 5240 4910
TRANSPORT WND (MPH) SE 15 SE 17
VENT RATE (KT-FT) 68120 73650
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-050800-
SOUTHERN HILLS-
330 PM AST THU JUN 4 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 0 10 10
TEMP (24H TREND) 69 (-2) 88 (+5) 69 89
RH % (24H TREND) 98 (+4) 60 (-4) 99 64
WIND 20FT/EARLY(MPH) SE 10 SE 11 E 9 E 12
WIND 20FT/LATE(MPH) E 10 SE 11 E 10 SE 13
MIXING HGT(FT-AGL/MSL) 6460 5710
TRANSPORT WND (MPH) SE 14 E 15
VENT RATE (KT-FT) 77520 74230
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-050800-
NORTH COASTAL PLAINS-
330 PM AST THU JUN 4 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 30 0 30
TEMP (24H TREND) 72 (-1) 91 (+1) 72 92
RH % (24H TREND) 97 (+2) 59 (+3) 100 62
WIND 20FT/EARLY(MPH) SE 11 E 13 SE 13 E 13
WIND 20FT/LATE(MPH) SE 11 E 17 SE 9 E 19
MIXING HGT(FT-AGL/MSL) 6140 5250
TRANSPORT WND (MPH) E 12 E 14
VENT RATE (KT-FT) 61400 63000
DISPERSION 5 5
DSI 3 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-050800-
NORTHERN HILLS-
330 PM AST THU JUN 4 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER CLEAR MCLEAR CLEAR PCLDY
PRECIP TYPE NONE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 0 30 0 50
TEMP (24H TREND) 69 (-2) 90 (+2) 70 90
RH % (24H TREND) 98 (0) 59 (+4) 99 64
WIND 20FT/EARLY(MPH) SE 10 E 11 SE 11 E 10
WIND 20FT/LATE(MPH) E 5 E 14 SE 6 E 16
MIXING HGT(FT-AGL/MSL) 7460 6240
TRANSPORT WND (MPH) E 8 E 10
VENT RATE (KT-FT) 52220 56160
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-050800-
WEST COAST-
330 PM AST THU JUN 4 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER CLEAR MCLEAR CLEAR PCLDY
PRECIP TYPE NONE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 0 20 0 40
TEMP (24H TREND) 72 (-1) 93 (+3) 73 93
RH % (24H TREND) 96 (+1) 58 (0) 98 62
WIND 20FT/EARLY(MPH) E 13 SE 14 E 10 E 13
WIND 20FT/LATE(MPH) E 13 SE 14 E 9 E 14
MIXING HGT(FT-AGL/MSL) 5730 4690
TRANSPORT WND (MPH) SE 14 E 12
VENT RATE (KT-FT) 68760 46900
DISPERSION 5 5
DSI 5 6 4 5
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-050800-
EASTERN INTERIOR-
330 PM AST THU JUN 4 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 30 20 20
TEMP (24H TREND) 70 (-2) 89 (+3) 70 90
RH % (24H TREND) 98 (+3) 62 (0) 100 65
WIND 20FT/EARLY(MPH) SE 12 SE 13 SE 11 E 13
WIND 20FT/LATE(MPH) SE 13 SE 13 E 11 E 13
MIXING HGT(FT-AGL/MSL) 7080 6500
TRANSPORT WND (MPH) SE 13 SE 15
VENT RATE (KT-FT) 77880 84500
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-050800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST THU JUN 4 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 50 30 30
TEMP (24H TREND) 68 (-3) 84 (+4) 68 85
RH % (24H TREND) 100 (+3) 69 (-1) 100 71
WIND 20FT/EARLY(MPH) SE 10 SE 11 SE 9 E 11
WIND 20FT/LATE(MPH) SE 10 SE 11 E 9 E 11
MIXING HGT(FT-AGL/MSL) 4530 4040
TRANSPORT WND (MPH) SE 15 SE 16
VENT RATE (KT-FT) 58890 56560
DISPERSION 5 5
DSI 5 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-050800-
CENTRAL MOUNTAIN RANGE-
330 PM AST THU JUN 4 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER CLEAR MCLEAR CLEAR MCLEAR
PRECIP TYPE NONE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 0 30 0 40
TEMP (24H TREND) 66 (-3) 88 (+6) 67 89
RH % (24H TREND) 100 (+3) 60 (-3) 100 65
WIND 20FT/EARLY(MPH) SE 8 SE 10 SE 6 E 9
WIND 20FT/LATE(MPH) SE 6 SE 10 SE 5 E 11
MIXING HGT(FT-AGL/MSL) 8330 6950
TRANSPORT WND (MPH) SE 8 SE 10
VENT RATE (KT-FT) 58310 62550
DISPERSION 5 5
DSI 2 6 2 5
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-050800-
CAYEY MOUNTAIN RANGE-
330 PM AST THU JUN 4 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 30 10
TEMP (24H TREND) 69 (-1) 84 (+4) 69 85
RH % (24H TREND) 100 (+1) 68 (-1) 100 71
WIND 20FT/EARLY(MPH) SE 9 SE 10 SE 8 E 10
WIND 20FT/LATE(MPH) SE 9 SE 10 E 9 E 11
MIXING HGT(FT-AGL/MSL) 5400 4940
TRANSPORT WND (MPH) SE 14 SE 15
VENT RATE (KT-FT) 64800 64220
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-050800-
VIEQUES-
330 PM AST THU JUN 4 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 50 30 20
TEMP (24H TREND) 75 (-2) 89 (+2) 75 90
RH % (24H TREND) 88 (+2) 62 (0) 93 63
WIND 20FT/EARLY(MPH) SE 16 SE 16 E 12 E 16
WIND 20FT/LATE(MPH) SE 17 SE 13 E 13 E 14
MIXING HGT(FT-AGL/MSL) 3290 3040
TRANSPORT WND (MPH) SE 18 E 18
VENT RATE (KT-FT) 52640 48640
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-050800-
CULEBRA-
330 PM AST THU JUN 4 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 20 20
TEMP (24H TREND) 77 (-1) 91 (+4) 76 91
RH % (24H TREND) 86 (+3) 60 (-4) 91 60
WIND 20FT/EARLY(MPH) SE 16 E 16 E 12 E 16
WIND 20FT/LATE(MPH) E 17 E 14 E 13 E 16
MIXING HGT(FT-AGL/MSL) 3320 2970
TRANSPORT WND (MPH) SE 20 E 20
VENT RATE (KT-FT) 56440 50490
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-050800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST THU JUN 4 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER CLEAR CLEAR CLEAR MCLEAR
PRECIP TYPE NONE NONE NONE SHOWERS
CHANCE PRECIP (%) 0 0 0 20
TEMP (24H TREND) 73 (-2) 93 (+4) 74 94
RH % (24H TREND) 91 (+1) 54 (-3) 94 57
WIND 20FT/EARLY(MPH) E 17 E 18 E 13 E 19
WIND 20FT/LATE(MPH) E 17 SE 19 E 14 SE 20
MIXING HGT(FT-AGL/MSL) 5410 4930
TRANSPORT WND (MPH) SE 17 E 20
VENT RATE (KT-FT) 81150 83810
DISPERSION 5 5
DSI 6 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-050800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST THU JUN 4 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 30 20
TEMP (24H TREND) 76 (-2) 87 (+2) 76 89
RH % (24H TREND) 88 (+4) 64 (-2) 92 65
WIND 20FT/EARLY(MPH) E 17 E 17 E 13 E 17
WIND 20FT/LATE(MPH) E 17 E 14 E 16 E 16
MIXING HGT(FT-AGL/MSL) 3310 3030
TRANSPORT WND (MPH) E 20 E 20
VENT RATE (KT-FT) 56270 51510
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-050800-
ST CROIX-
330 PM AST THU JUN 4 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 30 20
TEMP (24H TREND) 76 (-1) 89 (+3) 75 90
RH % (24H TREND) 89 (+5) 64 (-1) 94 65
WIND 20FT/EARLY(MPH) E 14 E 16 E 13 E 17
WIND 20FT/LATE(MPH) E 16 E 14 E 14 E 17
MIXING HGT(FT-AGL/MSL) 4430 4580
TRANSPORT WND (MPH) E 18 E 21
VENT RATE (KT-FT) 70880 82440
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
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